Tackling a sealing or insulation project? This Nomaco backer rod is your best friend. It's a 20-foot long coil of 1-1/4 inch diameter closed-cell foam rope, brand new in its package. This stuff is incredibly useful: you stuff it into cracks and gaps in concrete, drywall, around windows, or between PVC pipes BEFORE you apply caulk or sealant. It provides a backing so the sealant doesn't just sink into a deep gap, saving you money and creating a better, longer-lasting seal. Made in the USA, it's also great for acoustic insulation in walls, floors, or ceilings. It works on all sorts of surfaces: cement, metal, plywood, you name it. The closed-cell foam won't absorb water, so it's perfect for exterior applications too. The model is HBR-1-1/4\x20'. Whether you're a DIY homeowner or a professional contractor, having this backer rod on hand makes any sealing job cleaner, more professional, and more effective. A simple tool for a pro-grade finish.